linux-kernel - Re: [PATCH] [v4] module: don't ignore sysfs_create

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Message-ID: <ZhQUhvSCpz48f6tw@bombadil.infradead.org>
Date: Mon, 8 Apr 2024 09:00:06 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-modules@...r.kernel.org,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v4] module: don't ignore sysfs_create_link() failures

On Mon, Apr 08, 2024 at 10:05:58AM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The sysfs_create_link() return code is marked as __must_check, but the
> module_add_driver() function tries hard to not care, by assigning the
> return code to a variable. When building with 'make W=1', gcc still
> warns because this variable is only assigned but not used:
> 
> drivers/base/module.c: In function 'module_add_driver':
> drivers/base/module.c:36:6: warning: variable 'no_warn' set but not used [-Wunused-but-set-variable]
> 
> Rework the code to properly unwind and return the error code to the
> caller. My reading of the original code was that it tries to
> not fail when the links already exist, so keep ignoring -EEXIST
> errors.
> 
> Fixes: e17e0f51aeea ("Driver core: show drivers in /sys/module/")
> Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>

  Luis